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[3.14] gh-123299: Some copyedits to What's New in 3.14 (GH-133622) by miss-islington · Pull Request #133771 · python/cpython · GitHub

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[3.14] gh-123299: Some copyedits to What's New in 3.14 (GH-133622) #133771

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hugovk merged 1 commit into from
May 9, 2025
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[3.14] gh-123299: Some copyedits to What's New in 3.14 (GH-133622) #133771

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32 changes: 27 additions & 5 deletions Doc/whatsnew/3.14.rst
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Expand Up @@ -153,10 +153,10 @@ As another example, generating HTML attributes from data:
.. code-block:: python

attributes = {"src": "shrubbery.jpg", "alt": "looks nice"}
template = t"<img {attributes} />"
assert html(template) == '<img src="shrubbery.jpg" alt="looks nice" class="looks-nice" />'
template = t"<img {attributes}>"
assert html(template) == '<img src="shrubbery.jpg" alt="looks nice" class="looks-nice">'

Unlike f-strings, the ``html`` function has access to template attributes
Compared to using an f-string, the ``html`` function has access to template attributes
containing the original information: static strings, interpolations, and values
from the original scope. Unlike existing templating approaches, t-strings build
from the well-known f-string syntax and rules. Template systems thus benefit
Expand Down Expand Up @@ -443,6 +443,9 @@ Python without deferred evaluation of annotations, reaches its end of life in 20
In Python 3.14, the behavior of code using ``from __future__ import annotations``
is unchanged.

.. seealso::
:pep:`649`.


Improved error messages
-----------------------
Expand Down Expand Up @@ -584,8 +587,27 @@ Improved error messages
^^^^^^
SyntaxError: cannot use subscript as import target

.. seealso::
:pep:`649`.
* Improved error message when trying to add an instance of an unhashable type to
a :class:`dict` or :class:`set`. (Contributed by CF Bolz-Tereick and Victor Stinner
in :gh:`132828`.)

.. code-block:: pycon

>>> s = set()
>>> s.add({'pages': 12, 'grade': 'A'})
Traceback (most recent call last):
File "<python-input-1>", line 1, in <module>
s.add({'pages': 12, 'grade': 'A'})
~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
TypeError: cannot use 'dict' as a set element (unhashable type: 'dict')
>>> d = {}
>>> l = [1, 2, 3]
>>> d[l] = 12
Traceback (most recent call last):
File "<python-input-4>", line 1, in <module>
d[l] = 12
~^^^
TypeError: cannot use 'list' as a dict key (unhashable type: 'list')


.. _whatsnew314-pep741:
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